Mine

#!/usr/local/bin/perl

use strict;
use SNMP;
use Data::Dumper;

$ENV{'MIBS'}="ALL";  #Load all available MIBs
my $SNMP_TARGET = shift;
my $SNMP_COMMUNITY = shift;
my $DESTNAME = shift;
my $WARN = shift;
my $CRIT = shift;

my $SESSION = new SNMP::Session (DestHost => $SNMP_TARGET, 
                                Community => $SNMP_COMMUNITY,
                                Version => 1);


my $results = $SESSION->gettable( "snapmirrorStatusTable" );

foreach my $key ( sort { $a <=> $b }  keys %$results ){
  my $entry = $results->{$key};
  if( $entry->{snapmirrorDst} eq $DESTNAME ){
    my $lag = $entry->{snapmirrorLag}/100;
    if( $lag > $CRIT ){
      print "CRITICAL: Snapmirror Lag is $lag seconds!  Threshold is $CRIT.$/";
      exit( 2 );
    } elsif ( $lag > $WARN ){
      print "WARNING: Snapmirror Lag is $lag seconds!  Warning at $WARN, Critical at $CRIT.$/";
      exit( 1 );
    } else {
      print "OK: Snapmirror lag is $lag seconds.  Warning at $WARN, Critical at $CRIT.$/";
      exit( 0 );
    }
  }
}


Service definition:


define service{
        use                             generic-service
        host_name                       filerhostname
        service_description             Snapmirror Lag: destfiler:apps
        check_command                   check_snapmirror_lag!snmpcommunity!destfiler:apps!7200!14400
        }


define command {
        command_name    check_snapmirror_lag
        command_line    /usr/bin/perl $USER1$/snapmirrorlag.pl $HOSTADDRESS$ $ARG1$ $ARG2$ $ARG3$ $ARG4$
}